﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace DsaPrimeGenerator.Mvvm
{
    public class SimpleCommand : ICommand
    {

        #region Fields



        private readonly Action<object> _execute;



        private readonly Func<object, bool> _canExecute;



        #endregion



        #region Constructors



        public SimpleCommand(Action<object> execute, Func<object, bool> canExecute)
        {

            if (ReferenceEquals(execute, null))
            {

                throw new ArgumentNullException("execute");

            }

            _execute = execute;



            if (ReferenceEquals(canExecute, null))
            {

                throw new ArgumentNullException("canExecute");

            }

            _canExecute = canExecute;

        }



        #endregion



        public bool CanExecute(object parameter)
        {

            return _canExecute(parameter);

        }



        public void Execute(object parameter)
        {

            _execute(parameter);

        }



        public event EventHandler CanExecuteChanged
        {

            add
            {

                if (!ReferenceEquals(value, null))
                {

                    CommandManager.RequerySuggested += value;

                }

            }

            remove
            {

                if (!ReferenceEquals(value, null))
                {

                    CommandManager.RequerySuggested -= value;

                }

            }

        }

    } 

}
